CORE-SHELL PARTICLE AND METHOD FOR PRODUCING CORE-SHELL PARTICLE

• Main Authors: YONEDA, TAKASHIGE, KAWAI, YOHEI
• Format: Patent
• Language: English; French; Japanese
• Published: 14.01.2010
• Subjects: ADHESIVES; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; DYES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS; INORGANIC CHEMISTRY; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NANOTECHNOLOGY; NATURAL RESINS; PAINTS; PERFORMING OPERATIONS; POLISHES; PREPARATION OF CARBON BLACK; SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TRANSPORTING; TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES

Disclosed are core-shell particles each having a dense shell.  A method for producing the core-shell particles in a short time is also disclosed. A liquid containing core particles composed of a material having a dielectric constant of not less than 10 and a metal oxide precursor is irradiated with a microwave, thereby forming a shell of the metal oxide on the surface of each core particle.  Consequently, there are obtained core-shell particles having a shell thickness of 1-500 nm, a maximum value of 0.01 cc/g for the volume of pores having a pore diameter of not more than 3 nm in the shell in the pore volume histogram obtained by nitrogen adsorption, and an average particle diameter of 1-1000 nm in a dispersion medium. La présente invention concerne des particules à structure coer-enveloppe ayant chacune une enveloppe dense. L'invention concerne également un procédé permettant de produire en peu de temps les particules à structure coer-enveloppe. Un liquide contenant des particules centrales composées d'une substance ayant une constante diélectrique non inférieure à 10 et d'un précurseur d'oxyde métallique est irradié avec une micro-onde, ce qui permet la formation d'une enveloppe d'oxyde métallique à la surface de chaque particule centrale. Par conséquent, le procédé permet d'obtenir des particules à structure coer-enveloppe ayant une épaisseur d'enveloppe de 1-500 nm, une valeur maximum de 0,01 cc/g pour le volume des pores ayant un diamètre des pores non supérieur à 3 nm dans l'enveloppe dans l'histogramme de volume des pores obtenu par adsorption à l'azote, et un diamètre moyen des particules de 1-1000 nm dans un milieu de dispersion.